All-functional grinding board



FIG. 1 is a perspective view of a all-functional grinding board showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof. 

The ornamental design for an all-functional grinding board, as shown and described. 